D18586.diff
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	Index: head/sbin/mount/mount.c
	===================================================================
	--- head/sbin/mount/mount.c
	+++ head/sbin/mount/mount.c
	@@ -361,6 +361,7 @@
	else
	failok = 0;
	if (!(init_flags & MNT_UPDATE) &&
	+ !hasopt(fs->fs_mntops, "update") &&
	ismounted(fs, mntbuf, mntsize))
	continue;
	options = update_options(options, fs->fs_mntops,
	Index: head/share/man/man5/fstab.5
	===================================================================
	--- head/share/man/man5/fstab.5
	+++ head/share/man/man5/fstab.5
	@@ -190,6 +190,32 @@
	.Xr mount 8
	manual page.
	.Pp
	+If the option
	+.Dq update
	+is specified, it indicates that the status of an already mounted file
	+system should be changed accordingly.
	+This allows, for example, file systems mounted read-only to be upgraded
	+read-write and vice-versa.
	+By default, an entry corresponding to a file systems that is already
	+mounted is going to be skipped over when processing
	+.Nm ,
	+unless it's a root file system, in which case logic similar to
	+.Dq update
	+is applied automatically.
	+.Pp
	+The
	+.Dq update
	+option is typically used in conjuction with two
	+.Nm
	+files.
	+The first
	+.Nm
	+file is used to set up the initial set of file systems.
	+The second
	+.Nm
	+file is then run to update the initial set of file systems and
	+to add additional file systems.
	+.Pp
	The type of the mount is extracted from the
	.Fa fs_mntops
	field and stored separately in the